Nice, interesting article.

If morality is understood as a system of principles that minimize suffering and increase prosperity across all living beings, then it is objective in nature and best informed by science, just like gravity. This is a fairly intuitive idea of morality; It's the reason why some behaviours seem obviously "wrong" or "bad" and others "good", as in your stolen dinner example.

Moral relativism is an ironic result of religion. When people take their moral guidance from scripture rather than objective evidence, their moral views depend on their religion. To a non-religious observer, when many different cultures and religions hold different moral views, this gives the impression that morality itself is relative.